Parameter Effects and Reaction Pathways of Photoreduction of CO2 over TiO2/SO42– Photocatalyst

Lo, Cho-Ching; Hung, Chung-Hsuang; Yuan, Chung-Shin; Hung, Yu-Li

doi:10.1016/s1872-2067(07)60046-1

Cited by 30 publications

(14 citation statements)

References 26 publications

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“…This is different from the experimental data trend reporting that CO concentration decreases with increasing CO 2 partial pressure. However, the rule for predicted CO concentration matches the experiments by Lo et al [32]. It demonstrates that under some certain conditions, our model can still fully appropriately predict the trend with increasing CO 2 pressure.…”

Section: Validation Of the Modelssupporting

confidence: 81%

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Investigation of carbon dioxide photoreduction process in a laboratory-scale photoreactor by computational fluid dynamic and reaction kinetic modeling

Luo

Thompson

et al. 2021

Front. Chem. Sci. Eng.

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The production of solar fuels via the photoreduction of carbon dioxide to methane by titanium oxide is a promising process to control greenhouse gas emissions and provide alternative renewable fuels. Although several reaction mechanisms have been proposed, the detailed steps are still ambiguous, and the limiting factors are not well defined. To improve our understanding of the mechanisms of carbon dioxide photoreduction, a multi-physics model was developed using COMSOL. The novelty of this work is the computational fluid dynamic model combined with the novel carbon dioxide photoreduction intrinsic reaction kinetic model, which was built based on three-steps, namely gas adsorption, surface reactions and desorption, while the ultraviolet light intensity distribution was simulated by the Gaussian distribution model and Beer-Lambert model. The carbon dioxide photoreduction process conducted in a laboratory-scale reactor under different carbon dioxide and water moisture partial pressures was then modeled based on the intrinsic kinetic model. It was found that the simulation results for methane, carbon monoxide and hydrogen yield match the experiments in the concentration range of 10−4 mol·m−3 at the low carbon dioxide and water moisture partial pressure. Finally, the factors of adsorption site concentration, adsorption equilibrium constant, ultraviolet light intensity and temperature were evaluated.

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Section: Validation Of the Modelssupporting

confidence: 81%

“…The UV light irradiation plays a crucial role in photocatalytic processes and affects the photoreaction kinetics [9,32]. The reaction rate has a positive linear relationship with light intensity as shown in Eq.…”

Section: Effects Of Uv Light Intensitymentioning

confidence: 99%

Investigation of carbon dioxide photoreduction process in a laboratory-scale photoreactor by computational fluid dynamic and reaction kinetic modeling

Luo

Thompson

et al. 2021

Front. Chem. Sci. Eng.

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“…The reductions of carbonate acid and carbonate ions with their standard reduction potential are shown as Eqs. (24) and (25) [60]:…”

Section: Photoreduction Methods Over Tio 2 Of the Greenhouse Gas Co 2 mentioning

confidence: 99%

Photoreduction Processes over TiO2 Photocatalyst

Wahyuni¹,

Aprilita²

2019

Photocatalysts - Applications and Attributes

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This chapter presents the study of TiO 2 photocatalyst for the photoreduction of several reducible chemicals. The photocatalytic reduction of several toxic metal ions, including Ag (I), Cu(II), Cr(VI), Hg(II), and U(VI) in the presence of TiO 2 , in order to decrease their toxicity, is described. Photodeposition of the noble metals, such as Ag(I), Au(III), Pt(IV), and Pd(II) for doping purposes by photocatalytic reduction over TiO 2 , is also addressed. Conversion of the greenhouse gas of CO 2 into useful hydrocarbons and methanol by photocatalytic reduction using TiO 2 photocatalyst is highlighted. Several operating parameters in photoreduction processes that are photocatalyst dose, time of the irradiation, pH of the solution, and the initial concentration of the substrates (the reducible chemicals) are also reviewed.

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“…In particular, in fixed bed reactors [66], which are the simplest systems, only a small fraction of the photocatalyst is activated by light, decreasing the effectiveness of the whole process. The use of honeycomb monolyths [67] and optical fibres could solve the problem, though narrowness of cells would limit the light transfer and the mass transport of reagents/products to/from the active sites.…”

Section: On the Reactor Designmentioning

confidence: 99%

Sustainable Carbon Dioxide Photoreduction by a Cooperative Effect of Reactor Design and Titania Metal Promotion

et al. 2018

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An effective process based on the photocatalytic reduction of CO 2 to face on the one hand, the crucial problem of environmental pollution, and, on the other hand, to propose an efficient way to product clean and sustainable energy sources has been developed in this work. Particular attention has been paid to the sustainability of the process by using a green reductant (water) and TiO 2 as a photocatalyst under very mild operative conditions (room temperature and atmospheric pressure). It was shown that the efficiency in carbon dioxide photoreduction is strictly related to the process parameters and to the catalyst features. In order to formulate a versatile and high performing catalyst, TiO 2 was modified by oxide or metal species. Copper (in the oxide CuO form) or gold (as nanoparticles) were employed as promoting metal. Both photocatalytic activity and selectivity displayed by CuO-TiO 2 and Au-TiO 2 were compared, and it was found that the nature of the promoter (either Au or CuO) shifts the selectivity of the process towards two strategic products: CH 4 or H 2 . The catalytic results were discussed in depth and correlated with the physicochemical features of the photocatalysts.

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Parameter Effects and Reaction Pathways of Photoreduction of CO2 over TiO2/SO42– Photocatalyst

Cited by 30 publications

References 26 publications

Investigation of carbon dioxide photoreduction process in a laboratory-scale photoreactor by computational fluid dynamic and reaction kinetic modeling

Investigation of carbon dioxide photoreduction process in a laboratory-scale photoreactor by computational fluid dynamic and reaction kinetic modeling

Photoreduction Processes over TiO2 Photocatalyst

Sustainable Carbon Dioxide Photoreduction by a Cooperative Effect of Reactor Design and Titania Metal Promotion

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